Problem w/ org.lwjgl.LWJGLException:Pixel Format not accelerated

My boys usually play Minecraft. The other day my son was playing in the morning and then later in the afternoon got this error. They have played this game on this computer for months. So, why do we get the error now? Did my son do something that I can undo that caused this? I am not good with computers, so I need easy information. We have an HP. Anything else you want to know please ask, and maybe tell me where to find the info. We have tried many different things and nothing has worked. Any help would be greatly appreciated. Thanks, Bree

Hello Bree, did you get this sorted?

No, I never did get this figured out. I just kind of gave up on it. I tried a couple things that I can't even remember and nothing worked. Might you have any suggestions? I am trying to sound hopeful.